石墨电极烧蚀机理及实验  

Mechanism and Experiment of Graphite Electrode Erosion

作　　者：曾晗[1] 林福昌[1] 蔡礼[1] 刘刚[1] 李黎[1] 余丰[1] 齐向东[1] 

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《电工技术学报》2013年第1期43-49,86,共8页Transactions of China Electrotechnical Society

摘　　要：对于高性能的单次脉冲而言,石墨比传统金属材料更适合于在高能量转移情况下的脉冲放电工作环境。本文以热力学理论的热传导模型为出发点,结合实验中对烧蚀量的测量验证,探求石墨在高能脉冲放电情况下烧蚀的理论解释。依据热力学原理,建立了电极烧蚀过程的简化数学模型。由于石墨电极具有特殊的热力学性质,因此在微秒级或是放电持续时间更长的放电中,电极表面的温升过程时间较放电时间而言可以忽略不计。此时可近似认为开关电荷转移量与电极烧蚀量呈线性关系。该结论可以从实测数据中得到验证。In a high-powered single pulse device,graphite electrode is better than other ordinary metal electrodes for high energy transfer pulse discharge.This paper mainly investigates the erosion mechanism of graphite electrode with the theory of thermodynamics and experiment results in high energy pulse discharge.Based on thermodynamic principles,the simplified mathematical model of the electrode erosion process is built.Because of the special thermodynamic properties,the duration of temperature rising process on the graphite electrode surface could be ignored,during the microsecond or longer discharges duration.It can be known the relationship between electrode erosion and transfer charge is linear.That can be proved by results of experiments.

关 键 词：气体开关 石墨电极 烧蚀机理 电荷转移量 

分 类 号：TN242[电子电信—物理电子学]